Fan beam CT apparatus with post-processing weighting of picture

Details Fan beam CT apparatus with post-processing weighting of picture Fan beam CT apparatus with post-processing weighting of picture

1977-05-03

1979-02-06

Smith, Alfred E.

Radiant energy

Inspection of solids or liquids by charged particles

Analyte supports

250360, A61B 602

Patent

active

041386116

ABSTRACT:
In a computerized tomographic apparatus in which a wide angled, fan-shaped distribution of radiation is rotated around a body to be radiographed and detectors are provided to produce electrical output signals indicative of radiation emergent from the body along many beam paths, the signals can be sorted into sets relating to parallel sets of beam paths distributed across a cross-sectional slice of the body. However, the beam paths to which the signals so sorted relate are non-uniformly spaced beam paths, and the invention provides means whereby a processing technique known as convolution, which is of proven usefulness in computerized tomography but which, for best accuracy, operates upon output signals relating to sets of uniformly spaced, parallel beam paths, can be applied to the signals as sorted and a post-processing error compensation is effected to restore accuracy.

REFERENCES:
patent: 3881110 (1975-04-01), Hounsfield et al.

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